Ball screws are the driving components used to convert rotational motion into linear in precision equipment. However, machining accuracy of equipment is directly determined by positioning ball screw. The authors analyze sustainability preload double-nut with raceway wear. A new wear model combining modified Archard theory and iterative interpolation method established variations depth. considering coupling relationship between loss proposed study life In addition, a novel running test bench...

At present, sea cucumbers, urchins, and other seafood products have become increasingly significant in the aquaculture industry. In traditional fishing operations, divers go underwater for fishing, complex environment can cause harm to divers’ bodies. Therefore, use of robots has a current trend. During process, rely on vision accurately detect cucumbers urchins. this paper, an algorithm target detection urchins environments is proposed based improved YOLOv5s. The following improvements are...

The accurate model of the load state for all balls under multidirectional is very helpful design process ball screws. contact deformation screw without consideration stress difference inaccurate. In this paper, a novel established by considering coupled axial, radial to study elastic displacement and position accuracy. deviation variation axial with dimension errors are investigated obtain influence on precision sustainability screw. including travel distribution studied different...

The field of rehabilitation robot has grown rapidly in these years. And soft actuated robots prove to have some unique advantages over rigid body motor-driven rehabilitative robots. In this paper, a with two degree freedom (DOF) was designed assist the elbow. Pneumatic muscles were built up and tested. They assembled make whole device. A set experiments conducted evaluate functioning. results analysis show that device could finish process on elbow under proper control. Future improvement are...

Ball screw is the driving functional component most frequently used for precision equipment. To a certain extent, transmission accuracy of equipment affected by position error ball caused elastic–plastic deformation between and raceway under overload impact. This article aims to investigate loss considering short-time A novel model combining Hertzian Thornton contact theories established describe variations in axial depths. Thus, can be defined as differential value initial no-loading travel...

Under the action of an external magnetic field, giant magnetostrictive material (GMM) is magnetized and generates magnetostriction, so its dimension will change accordingly. In this work, two structures are proposed for ball screw pre-tightening, but a finite element calculation shows that solid cylindrical GMM better than hollow one because it has more uniform magnetization intensity. So used to build pre-tightening structure. Experiments show when working current changes from −3 A 3 A,...

According to the present situation that treatment means for apoplectic patients is lagging and weak, a set of long-distance exoskeleton rehabilitation training system with 5 DOF upper limb was developed. First, mechanical structure control were designed. Then new kind building method virtual environment proposed. The created complex model effectively good portability. used design scenes patients' in which human can move following trainer on real time, reflect movement condition arm patient...

A whole-arm exoskeleton rehabilitation robot based on PNF is presented in this paper for treating dyskinesia. This includes an arm robot(6-DoF) and a hand robot(6-DoF), which can achieve comprehensive training shoulder, elbow, wrist fingers. finite element analysis has been finished security of structure, designed by medicine man machine engineering. The forward kinematics solution model calculation validated simulation control future.

In order to improve the flattening quality of sheet metal with free-form surface, a system was developed. The framework proposed and key technologies such as mesh measuring criterion, center triangle indexing algorithm, coordinate transforming principle, initial method were elaborated. Moreover, planar spring–mass model presented optimize result, flowchart designed. Finally, three simulation examples carried out comparison results indicated that proved feasible efficient.

In the context of test data generation, symbolic execution gets more attention as computing power increases continuously. Experiments show that generation tools based on can get high coverage and find bugs real applications. However, still has limitations in handling some complex program structures such pointers, arrays library functions. To address problem, this study proposes a technique called lazy execution, which combines with evaluation strategy. The authors approach is motivated by...

Given the importance of underwater manipulator in process grasping and carrying object, simple 4-joint is designed. Considering factors water flow, hydrodynamic model established by using Morision formula. Through numerical calculation method, effects buoyancy, resistance added mass force on dynamics are analyzed. On this basis, controllers conventional sliding mode algorithm double loop integral established. The simulation results trajectory tracking show that: has better performances...

Ocean is a strategic development base of biology, energy, water and metal. It has great potential for development. Underwater vehicle necessary equipment explore the underwater resources. So this project intends to develop equipment. In paper, virtual prototype established based on ADAMS introduced then analyze mechanical model. At last, experiment done in shallow sea. The shows that self-development remotely operated can satisfy with usage requirements.

In order to meet the needs of field investigation, this paper designs a joint swing arm tracked robot with embedded driving system. Through structural design and motion calculation robot, transmission device is installed in crawler; obstacle-surmounting ability analyzed by using simplified mathematical model; finally, force simulation analysis key axis carried out ensure correctness design. The designed reduces volume certain extent, increases flexibility, improves portability, easy achieve...